[XeTeX] r34804 fails to typeset a vertical Japanese, for which r34711 works fine

[Akira Kakuto]

Hi Jiang,

> Please let me know if there are any further issues.

I think r34832 is great. Thanks a lot.
However, if I use TrueType fonts in XeTeX (.ttf or .ttc), xdvipdfmx crashes
with the message:

otf_cmap>> Creating ToUnicode CMap for "c:/Windows/fonts/msmincho.ttc"...

I attach a ttctest.tex and ttftest.tex for the test.

Thanks,
Akira
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